Two teams of Hearthstone personalities are ready to do battle.

The Hearthstone Oktoberbrawl is now underway, pitting Team Void—Dog, Thijs, and J4CKIECHAN—against Team Light—Kripparrian, Reynad, and Alliestrasza—in a month-long battle for ultimate (at least until the next time) supremacy. The catch is that each pro must use a fresh account for the event, ensuring that everyone starts off on equal footing. Fans can get in on the action too by using one of two free card backs available through Amazon Prime to do battle on behalf of their chosen side.

Each "Oktoberbrawler" will be given ten Classic packs and a Welcome Bundle to start their new account, and on Monday of each week from today until October 10, will be given another ten packs from two different expansions. On Wednesdays, each team member will also receive "a portion of a second pack award based on a percentage of total wins earned in Ranked Play by players using their team’s card back."

That's where you come in. Twitch Prime members can claim two new card backs, Void and Light, which can be used to represent one side or the other in ranked matches. Winning Ranked matches means better rewards for your chosen trio of champions, and presumably, an edge in their Friday "grudge matches." It's not a guarantee that your side will win, but you don't want to bring a knife to a gun fight, right?